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annotate graal/com.oracle.graal.api.replacements/src/com/oracle/graal/api/replacements/SnippetReflectionProvider.java @ 18845:f57d86eb036f

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removed Node factory methods
author Doug Simon <doug.simon@oracle.com>
date Mon, 12 Jan 2015 20:39:04 +0100
parents 25a21e1794ec
children 48c1ebd24120
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1 /*
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2 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.api.replacements;
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24
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25 import java.lang.reflect.*;
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26 import java.util.*;
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27
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28 import com.oracle.graal.api.meta.*;
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29
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30 /**
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31 * Reflection operations on values represented as {@linkplain JavaConstant constants} for the
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32 * processing of snippets. Snippets need a direct access to the value of object constants, which is
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33 * not allowed in other parts of Graal to enforce compiler-VM separation.
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34 * <p>
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35 * This interface must not be used in Graal code that is not related to snippet processing.
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36 */
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37 public interface SnippetReflectionProvider {
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38
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39 /**
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40 * Creates a boxed {@link Kind#Object object} constant.
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41 *
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42 * @param object the object value to box
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43 * @return a constant containing {@code object}
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44 */
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45 JavaConstant forObject(Object object);
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46
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47 /**
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48 * Gets the object reference a given constant represents if it is of a given type. The constant
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49 * must have kind {@link Kind#Object}.
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50 *
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51 * @param type the expected type of the object represented by {@code constant}. If the object is
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52 * required to be of this type, then wrap the call to this method in
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53 * {@link Objects#requireNonNull(Object)}.
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54 * @param constant an object constant
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55 * @return the object value represented by {@code constant} cast to {@code type} if it is an
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56 * {@link Class#isInstance(Object) instance of} {@code type} otherwise {@code null}
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57 */
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58 <T> T asObject(Class<T> type, JavaConstant constant);
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59
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60 /**
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61 * Gets the object reference a given constant represents if it is of a given type. The constant
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62 * must have kind {@link Kind#Object}.
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63 *
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64 * @param type the expected type of the object represented by {@code constant}. If the object is
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65 * required to be of this type, then wrap the call to this method in
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66 * {@link Objects#requireNonNull(Object)}.
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67 * @param constant an object constant
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68 * @return the object value represented by {@code constant} if it is an
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69 * {@link ResolvedJavaType#isInstance(JavaConstant) instance of} {@code type} otherwise
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70 * {@code null}
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71 */
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72 Object asObject(ResolvedJavaType type, JavaConstant constant);
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73
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74 /**
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75 * Creates a boxed constant for the given kind from an Object. The object needs to be of the
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76 * Java boxed type corresponding to the kind.
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77 *
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78 * @param kind the kind of the constant to create
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79 * @param value the Java boxed value: a {@link Byte} instance for {@link Kind#Byte}, etc.
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80 * @return the boxed copy of {@code value}
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81 */
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82 JavaConstant forBoxed(Kind kind, Object value);
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83
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84 /**
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85 * Resolves a parameter or return type involved in snippet code to a {@link Class}.
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86 */
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87 static Class<?> resolveClassForSnippet(JavaType type) throws ClassNotFoundException {
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88 try {
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89 return Class.forName(type.toClassName());
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90 } catch (ClassNotFoundException e) {
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91 // Support for -XX:-UseGraalClassLoader
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92 return Class.forName(type.toClassName(), false, ClassLoader.getSystemClassLoader());
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93 }
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94 }
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95
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96 /**
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97 * Invokes a given method via {@link Method#invoke(Object, Object...)}.
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98 */
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99 default Object invoke(ResolvedJavaMethod method, Object receiver, Object... args) {
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100 try {
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101 JavaType[] parameterTypes = method.toParameterTypes();
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102 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
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103 for (int i = 0; i < parameterClasses.length; ++i) {
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104 JavaType type = parameterTypes[i];
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105 if (type.getKind() != Kind.Object) {
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106 parameterClasses[i] = type.getKind().toJavaClass();
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107 } else {
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108 parameterClasses[i] = resolveClassForSnippet(parameterTypes[i]);
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109 }
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110 }
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111
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112 Class<?> c = resolveClassForSnippet(method.getDeclaringClass());
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113 if (method.isConstructor()) {
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114 Constructor<?> javaConstructor = c.getDeclaredConstructor(parameterClasses);
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115 javaConstructor.setAccessible(true);
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116 return javaConstructor.newInstance(args);
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117 } else {
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118 Method javaMethod = c.getDeclaredMethod(method.getName(), parameterClasses);
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119 javaMethod.setAccessible(true);
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120 return javaMethod.invoke(receiver, args);
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121 }
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122 } catch (IllegalAccessException | InstantiationException | InvocationTargetException | ClassNotFoundException | NoSuchMethodException ex) {
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123 throw new IllegalArgumentException(ex);
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124 }
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125 }
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126
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127 /**
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128 * Gets the constant value of this field. Note that a {@code static final} field may not be
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129 * considered constant if its declaring class is not yet initialized or if it is a well known
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130 * field that can be updated via other means (e.g., {@link System#setOut(java.io.PrintStream)}).
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131 *
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132 * @param receiver object from which this field's value is to be read. This value is ignored if
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133 * this field is static.
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134 * @return the constant value of this field or {@code null} if this field is not considered
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135 * constant by the runtime
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136 */
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137 default Object readConstantFieldValue(JavaField field, Object receiver) {
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138 try {
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139 Class<?> c = resolveClassForSnippet(field.getDeclaringClass());
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140 Field javaField = c.getDeclaredField(field.getName());
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141 javaField.setAccessible(true);
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142 return javaField.get(receiver);
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143 } catch (IllegalAccessException | ClassNotFoundException | NoSuchFieldException ex) {
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144 throw new IllegalArgumentException(ex);
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145 }
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146 }
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147
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148 /**
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149 * Creates a new array with a given type as the component type and the specified length. This
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150 * method is similar to {@link Array#newInstance(Class, int)}.
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151 */
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152 default Object newArray(ResolvedJavaType componentType, int length) {
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153 try {
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154 return Array.newInstance(resolveClassForSnippet(componentType), length);
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155 } catch (ClassNotFoundException e) {
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156 throw new IllegalArgumentException(e);
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157 }
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158 }
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159
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160 /**
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161 * Gets the value to bind to a parameter in a {@link SubstitutionGuard} constructor.
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162 *
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163 * @param type the type of a parameter in a {@link SubstitutionGuard} constructor
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164 * @return the value that should be bound to the parameter when invoking the constructor or null
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165 * if this provider cannot provide a value of the requested type
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166 */
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167 Object getSubstitutionGuardParameter(Class<?> type);
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168
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169 /**
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170 * Gets the value to bind to an injected parameter in a node intrinsic.
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171 *
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172 * @param type the type of a parameter in a node intrinsic constructor
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173 * @return the value that should be bound to the parameter when invoking the constructor or null
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174 * if this provider cannot provide a value of the requested type
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175 */
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176 Object getInjectedNodeIntrinsicParameter(ResolvedJavaType type);
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177 }